Thanks for the review but just to clear something up the way the G4 operates and the way the G5 ISO operates are completely different. Inconsistent power delivery and lag during manual shifts were not uncommon G4 complaints which lead to the G5 ISO development. Also for what it's worth I expect at some point in the future the JB4 will be able to flash your DME directly so you get the best of both worlds with it.
Mike